Split settings into submodules

Created by: ghost

Using a structure to comply to 12factor (http://12factor.net/) with the settings and allow environments variables and different settings for deveplopment, production or maybe even per developer.

Discussion/Ideas:

• https://code.djangoproject.com/wiki/SplitSettings
• TwoScoopsOfDjango-Style: https://github.com/twoscoops/django-twoscoops-project/tree/develop/project_name/project_name/settings
• One Proposition woul be to use something like django-dotenv